Abstract: LUX is a two-phase (liquid/gas) xenon time projection chamber designed to
detect nuclear recoils resulting from interactions with dark matter particles.
Signals from the detector are processed with an FPGA-based digital trigger
system that analyzes the incoming data in real-time, with just a few
microsecond latency. The system enables first pass selection of events of
interest based on their pulse shape characteristics and 3D localization of the
interactions. It has been shown to be >99% efficient in triggering on S2
signals induced by only few extracted liquid electrons. It is continuously and
reliably operating since its full underground deployment in early 2013. This
document is an overview of the systems capabilities, its inner workings, and
its performance.

Comments:

11 pages, 26 figures, added some key points to the abstract, and conclusions, no change in results, accepted for publication in Nuclear Instruments and Methods in Physics Research Section A